Lake Marie, located in Napa, California, is a state-regulated reservoir with a primary purpose of water supply for irrigation and other uses. Built in 1908, this earth dam stands at a height of 60 feet and has a storage capacity of 170 acre-feet. With a surface area of 8 acres and a drainage area of 1.06 square miles, Lake Marie plays a crucial role in the water resource management of the region.

Managed by the California Department of Water Resources (DWR) and Safety of Dams, Lake Marie has a high hazard potential but is currently in satisfactory condition according to a 2017 assessment. The dam has a spillway width and other structural details are not specified in the available data. The reservoir is situated along the Tr Tulucay Creek and is part of the Sacramento District.

Overall, Lake Marie serves as a vital water source for the surrounding areas, showcasing the intersection of water resource management and climate considerations in maintaining the safety and sustainability of this essential infrastructure.